I have a customer who needs to block a specific excel file from leaving their network. We have v5.4.1 running on their firewall and I'm busy reading up on DLP and came across the watermarking feature / option, but I do not find it anywhere in the GUI. must this be enabled in CLI or has this been removed from 5.4? they still mention it in the FortiOS 5.4.0 Handbook - Security Profiles.
Is there another way I can go about creating the DLP filter for this specific Excel file? bearing in mind anybody could potentially rename the file as well...